参考文档

https://kubernetes.io/zh/docs/tasks/administer-cluster/change-pv-reclaim-policy/

PV的回收策略

PersistentVolumes 可以有多种回收策略，包括 “Retain”、”Recycle” 和 “Delete”。对于动态配置的 PersistentVolumes 来说，默认回收策略为 “Delete”。这表示当用户删除对应的 PersistentVolumeClaim 时，动态配置的 volume 将被自动删除。如果 volume 包含重要数据时，这种自动行为可能是不合适的。那种情况下，更适合使用 “Retain” 策略。使用 “Retain” 时，如果用户删除 PersistentVolumeClaim，对应的 PersistentVolume 不会被删除。相反，它将变为 Released 状态，表示所有的数据可以被手动恢复。

修改PV回收策略方法

kubectl patch pv your-pv-name  -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'

查看PV的回收状态

[root@elasticsearch01 ~]# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                                            STORAGECLASS   REASON   AGE
ceph-rbd-pv                                20Gi       RWO            Recycle          Bound    default/ceph-rbd-pv-claim                                                212d
jenkins-home-pv                            40Gi       RWO            Recycle          Bound    default/jenkins-home-pvc                                                 98d
pvc-e7967cfe-7ded-11e9-a09d-52540089b2b6   50Gi       RWO            Delete           Bound    default/zhidao-harbor-chartmuseum                rbd                     90d
pvc-e7974d1c-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/zhidao-harbor-jobservice                 rbd                     90d
pvc-e7985b55-7ded-11e9-a09d-52540089b2b6   2000Gi     RWO            Delete           Bound    default/zhidao-harbor-registry                   rbd                     90d
pvc-e7d38097-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/database-data-zhidao-harbor-database-0   rbd                     90d
pvc-e7da3f3c-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/data-zhidao-harbor-redis-0               rbd                     90d

修改PV的回收状态

[root@elasticsearch01 ~]# kubectl patch pv pvc-e7da3f3c-7ded-11e9-a09d-52540089b2b6  -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
persistentvolume/pvc-e7da3f3c-7ded-11e9-a09d-52540089b2b6 patched

查看PV回收状态已经改成Retain了

[root@elasticsearch01 ~]# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                                            STORAGECLASS   REASON   AGE
ceph-rbd-pv                                20Gi       RWO            Recycle          Bound    default/ceph-rbd-pv-claim                                                212d
jenkins-home-pv                            40Gi       RWO            Recycle          Bound    default/jenkins-home-pvc                                                 98d
pvc-e7967cfe-7ded-11e9-a09d-52540089b2b6   50Gi       RWO            Delete           Bound    default/zhidao-harbor-chartmuseum                rbd                     90d
pvc-e7974d1c-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/zhidao-harbor-jobservice                 rbd                     90d
pvc-e7985b55-7ded-11e9-a09d-52540089b2b6   2000Gi     RWO            Delete           Bound    default/zhidao-harbor-registry                   rbd                     90d
pvc-e7d38097-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/database-data-zhidao-harbor-database-0   rbd                     90d
pvc-e7da3f3c-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Retain           Bound    default/data-zhidao-harbor-redis-0               rbd                     90d